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A stone propelled from a catapult with a speed of 50m/s attains a height of 100m.Calculate:(a)the time of flight?

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Just as long as anything else that goes up 100 meters and falls

Which is twice as long as it takes to fall 100 meters

h = (1/2) g t^2
100 = 4.9 t^2
t = 4.52 seconds to fall

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